What directories I must backup for reinstalling Windows 7? [closed]

view full story

http://serverfault.com – I'm reinstalling a Windows 7 PC and want backup all the users generated data to latter decide what data can be useful. What directories I must backup? I will format the PC and all importante data must be saved. I have doubts particularly about C:\Users\USER_NAME\AppData and how save it using a Ubuntu live CD in case I don't have access to the Windows 7 PC. AppData have a lot of syslink inside! I have all programs installation, so system and programs data are not important at least users generate it. (HowTos)